90801-SB0-000 Plug - Overview. The 90801-SB0-000 Plug is an essential rubber plug used within Honda marine engine systems. It acts as a change reinforcement plug, serving both as a seal and stopper to prevent water from entering or fluids from escaping critical engine compartments. This part supports Honda's marine engine reliability by ensuring seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM rubber plug designed for use in Hon